This portable combustion gas analyzer measures O2, CO, and NO in residential heating systems. It’s compact, easy to use, and cost-effective. The analyzer features electrochemical sensor technology, air and gas temperature measurement, a purge pump to avoid CO sensor saturation, and a condensate trap with manual drain. The analyzer calculates CO2, efficiency, excess air, and O2 correction. It has an integrated pump with a flow rate of 0-5-0.8 LPM, internal memory with USB transfer, and Bluetooth connection. The aluminium housing has magnets and is powered by a rechargeable lithium-ion battery for up to 5 hours of operation. An infrared printer is also available as an optional feature, and the device has a backlit LCD display.